Does Cognito Forms support logic jump and internal duplicity check? And if yes, how?
To implement logic jump with multiple pages, just add page breaks to the form and select "Show Next Page - When" to specify the logic for when a page should be included in the user flow through the form:
The same conditional logic can be applied to any field, section or repeating section, allowing you to also implement logic jump on single page forms where this makes sense. The logic then applies to all printed or emailed views of the form, hiding information and fields that are irrelevant based on the entered information.
I am not entirely certain what the question regarding internal duplicity check refers to. However, Cognito Forms does not currently support form submission restrictions based on IP address or email checks to prevent duplicate submissions, though spam prevention is built into every form to block bots. We do have additional features to block duplicate submissions on our Idea Board.